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Showing 1–24 of 66 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Tamoxifen 20 mg Clear all
Recruiting Phase 2 Interventional

Acolbifene Versus Low Dose Tamoxifen for the Prevention of Breast Cancer in Premenopausal Women at High Risk for Development of Breast Cancer

NCT05941520
View directory record Official record
Conditions
Breast Atypical Hyperplasia, Breast Carcinoma, Breast Ductal Carcinoma In Situ, Breast Lobular Carcinoma In Situ
Interventions
Acolbifene Hydrochloride, Biospecimen Collection, Mammography, Questionnaire Administration, Random Periareolar Fine-Needle Aspiration, Tamoxifen
Drug · Procedure · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
35 Years and older · Female only
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
4
States / cities
Duarte, California • Chicago, Illinois • Kansas City, Kansas + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Endocrine Response in Women With Invasive Lobular Breast Cancer

NCT02206984
View directory record Official record
Conditions
Breast Cancer
Interventions
Tamoxifen, Anastrozole, Fulvestrant
Drug
Lead sponsor
Priscilla McAuliffe
Other
Eligibility
Female only
Enrollment
201 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
12
States / cities
Birmingham, Alabama • San Francisco, California • Washington D.C., District of Columbia + 8 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Everolimus and Letrozole or Hormonal Therapy to Treat Endometrial Cancer

NCT02228681
View directory record Official record
Conditions
Advanced, Persistent, or Recurrent Endometrial Cancer
Interventions
Everolimus, Tamoxifen, Letrozole, Medroxyprogesterone Acetate
Drug
Lead sponsor
GOG Foundation
Network
Eligibility
18 Years and older · Female only
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
26
States / cities
Aurora, Colorado • Miami, Florida • Columbus, Georgia + 21 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional

Phase II Metastatic ER+/PgR+ Nolvadex +/- Iressa Study

NCT00229697
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Gefitinib, Tamoxifen
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 130 Years · Female only
Enrollment
317 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2015
U.S. locations
4
States / cities
Berkeley, California • Palm Springs, California • St Louis, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 4, 2015 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Tamoxifen for Progressive Transitional Cell Carcinoma Following Previous Chemotherapy Treatment

NCT00710970
View directory record Official record
Conditions
Urinary Bladder Neoplasms
Interventions
Tamoxifen
Drug
Lead sponsor
Seth Lerner
Other
Eligibility
18 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 23, 2022 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Primary Chemotherapy With Docetaxel-Capecitabine and Doxorubicin-Cyclophosphamide in Breast Cancer

NCT00005908
View directory record Official record
Conditions
Breast Cancer, Breast Neoplasm
Interventions
Docetaxel - Dose A, Anastrozole, cyclophosphamide, Docetaxel - Dose B, Doxorubicin hydrochloride, Tamoxifen Citrate, Capecitabine - Dose B, Capecitabine - Dose A
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2008
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 18, 2013 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 3 Interventional

Phase III Comparison of Adjuvant Chemotherapy W/High-Dose Cyclophosphamide Plus Doxorubicin (AC) vs Sequential Doxorubicin Fol by Cyclophosphamide (A-C) in High Risk Breast Cancer Patients With 0-3 Positive Nodes (Intergroup, CALGB 9394)

NCT00590785
View directory record Official record
Conditions
High Risk, Breast Cancer, Positive Nodes, Cyclophosphamide, Doxorubicin
Interventions
Doxorubicin, Cyclophosphamide, G-CSF, tamoxifen, ciprofloxacin
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 24, 2017 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Tamoxifen Therapy to Treat Pulmonary Arterial Hypertension

NCT03528902
View directory record Official record
Conditions
Hypertension, Pulmonary Arterial Hypertension, Familial Primary Pulmonary Hypertension, Primary Pulmonary Hypertension, Lung Diseases, Tamoxifen, Estrogen Receptor Antagonist, Hormone Antagonists, Estrogens
Interventions
Tamoxifen, Placebo Oral Tablet
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 4, 2024 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Selective Estrogen Receptor Modulators to Enhance the Efficacy of Viral Reactivation With Histone Deacetylase Inhibitors

NCT03382834
View directory record Official record
Conditions
HIV Infections
Interventions
Tamoxifen, Vorinostat, Antiretroviral drugs
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 65 Years · Female only
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
14
States / cities
Birmingham, Alabama • Los Angeles, California • San Francisco, California + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 2, 2024 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 4 Interventional Results available

Study Of MK-0752 In Combination With Tamoxifen Or Letrozole to Treat Early Stage Breast Cancer

NCT00756717
View directory record Official record
Conditions
Breast Cancer
Interventions
MK-0752
Drug
Lead sponsor
Loyola University
Other
Eligibility
18 Years and older · Female only
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Maywood, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 3, 2019 · Synced Sep 29, 2026, 1:24 PM EDT
Active, not recruiting Phase 2 Interventional

(Z)-Endoxifen for the Treatment of Premenopausal Women With ER+/HER2- Breast Cancer

NCT05607004
View directory record Official record
Conditions
Breast Neoplasms, Invasive Breast Cancer, Estrogen-receptor-positive Breast Cancer, HER2-negative Breast Cancer
Interventions
(Z)-endoxifen, goserelin
Drug
Lead sponsor
Atossa Therapeutics, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
14
States / cities
Phoenix, Arizona • Tucson, Arizona • Los Angeles, California + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 7, 2026 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 3 Interventional

Chemotherapy in Treating Women With Breast Cancer That Can Be Surgically Removed

NCT00002707
View directory record Official record
Conditions
Breast Cancer
Interventions
Cyclophosphamide, Docetaxel, Doxorubicin, Tamoxifen
Drug
Lead sponsor
NSABP Foundation Inc
Network
Eligibility
Female only
Enrollment
2,411 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1995 – 2010
U.S. locations
134
States / cities
Huntsville, Alabama • Phoenix, Arizona • Greenbrae, California + 115 more
Source: ClinicalTrials.gov public record
Updated Feb 2, 2010 · Synced Sep 29, 2026, 1:24 PM EDT
Recruiting Phase 3 Interventional

A Study of Elacestrant Versus Standard Endocrine Therapy in Women and Men With ER+,HER2-, Early Breast Cancer With High Risk of Recurrence

NCT06492616
View directory record Official record
Conditions
Breast Cancer
Interventions
Elacestrant, Anastrozole, Letrozole, Exemestane, Tamoxifen
Drug
Lead sponsor
Stemline Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
4,220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2032
U.S. locations
176
States / cities
Daphne, Alabama • Chandler, Arizona • Gilbert, Arizona + 139 more
Source: ClinicalTrials.gov public record
Updated Sep 14, 2026 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 1Phase 2 Interventional Results available

A Study of Multiple Immunotherapy-Based Treatment Combinations in Hormone Receptor (HR)-Positive Human Epidermal Growth Factor Receptor 2 (HER2)-Negative Breast Cancer

NCT03280563
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Atezolizumab (MPDL3280A), an engineered anti-programmed death-ligand 1 (PD-L1) antibody, Bevacizumab, Entinostat, Exemestane, Fulvestrant, Ipatasertib, Tamoxifen, Abemaciclib
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years and older · Female only
Enrollment
144 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
14
States / cities
Birmingham, Alabama • San Francisco, California • Stanford, California + 11 more
Source: ClinicalTrials.gov public record
Updated Nov 9, 2025 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 3 Interventional Results available

Anastrozole or Tamoxifen in Treating Postmenopausal Women With Ductal Carcinoma in Situ Who Are Undergoing Lumpectomy and Radiation Therapy

NCT00053898
View directory record Official record
Conditions
Breast Cancer
Interventions
anastrozole, tamoxifen citrate, Radiation Therapy
Drug · Radiation
Lead sponsor
NSABP Foundation Inc
Network
Eligibility
Female only
Enrollment
3,104 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2016
U.S. locations
724
States / cities
Anniston, Alabama • Birmingham, Alabama • Huntsville, Alabama + 499 more
Source: ClinicalTrials.gov public record
Updated Sep 19, 2018 · Synced Sep 29, 2026, 1:24 PM EDT
Recruiting Phase 2 Interventional

A Study of Imlunestrant (LY3484356) in Premenopausal Women With Estrogen Receptor-Positive (ER+) Human Epidermal Growth Factor Receptor 2 Negative (HER2-) Early Breast Cancer

NCT07287098
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Imlunestrant, Goserelin, Tamoxifen 20 mg
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years and older · Female only
Enrollment
600 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
34
States / cities
Birmingham, Alabama • Chandler, Arizona • Phoenix, Arizona + 27 more
Source: ClinicalTrials.gov public record
Updated Sep 21, 2026 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 3 Interventional

Study of Tamoxifen and Raloxifene (STAR) for the Prevention of Breast Cancer in Postmenopausal Women

NCT00003906
View directory record Official record
Conditions
Breast Cancer
Interventions
Raloxifene, Tamoxifen
Drug
Lead sponsor
NSABP Foundation Inc
Network
Eligibility
35 Years and older · Female only
Enrollment
19,747 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2012
U.S. locations
492
States / cities
Huntsville, Alabama • Mobile, Alabama • Anchorage, Alaska + 369 more
Source: ClinicalTrials.gov public record
Updated Oct 5, 2015 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

A Study for Safety and Effectiveness of IMC-A12 by Itself or Combined With Antiestrogens to Treat Breast Cancer

NCT00728949
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
IMC-A12 (cixutumumab), tamoxifen, Anastrozole, Letrozole, Exemestane, Fulvestrant
Biological · Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years and older · Female only
Enrollment
93 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2015
U.S. locations
9
States / cities
Scottsdale, Arizona • Chicago, Illinois • Westwood, Kansas + 6 more
Source: ClinicalTrials.gov public record
Updated Jun 5, 2018 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study To Determine If Coadministration Of Tamoxifen Alters The Extent Or Rate Of Palbociclib (PD-0332991) Absorption Or Elimination In Healthy Male Volunteers

NCT01821066
View directory record Official record
Conditions
Healthy
Interventions
PD-0332991 alone, Tamoxifen 60 mg, Tamoxifen 20 mg, PD-0332991 combination
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 7, 2015 · Synced Sep 29, 2026, 1:24 PM EDT
Completed No phase listed Observational Results available

Study Evaluating Changes In Mammographic Breast Density

NCT00774267
View directory record Official record
Conditions
Osteoporosis
Interventions
BZA 20 mg/CE 0.45 mg, BZA 20 mg/CE 0.625 mg, Raloxifene 60 mg, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
40 Years to 75 Years · Female only
Enrollment
507 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
22
States / cities
Fort Myers, Florida • Gainesville, Florida • New Port Richey, Florida + 19 more
Source: ClinicalTrials.gov public record
Updated Apr 7, 2014 · Synced Sep 29, 2026, 1:24 PM EDT
Terminated Phase 1 Interventional Results available

Study of Infigratinib in Combination With Tamoxifen in Hormone Receptor Positive, HER2 Negative, FGFR Altered Advanced Breast Cancer

NCT04504331
View directory record Official record
Conditions
Breast Cancer, HER2-negative Breast Cancer, ER Positive Breast Cancer, PR-Positive Breast Cancer
Interventions
Infigratinib, Tamoxifen, Omnipaque 350, Iopamidol, Computed tomography (CT)
Drug · Diagnostic Test
Lead sponsor
Jennifer Lee Caswell-Jin
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Feb 11, 2026 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Neoadjuvant Endocrine Therapy in Hormone Receptor-Positive, Human Epidermal Growth Factor Receptor 2 (HER2)-Negative Node-Negative Breast Cancer

NCT03219476
View directory record Official record
Conditions
Breast Cancer, Invasive Breast Cancer
Interventions
Anastrozole, Letrozole, Exemestane, Tamoxifen
Drug
Lead sponsor
Medical College of Wisconsin
Other
Eligibility
18 Years and older · Female only
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2025
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Apr 28, 2025 · Synced Sep 29, 2026, 1:24 PM EDT
Terminated Not applicable Interventional Results available

Chemotherapy Before Surgery and Tissue Sample Collection in Patients With Stage IIA-IIIC Breast Cancer

NCT01897441
View directory record Official record
Conditions
Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer, Stage IIIC Breast Cancer, Stage IV Breast Cancer
Interventions
Cyclophosphamide, Cytology Specimen Collection Procedure, Doxorubicin Hydrochloride, Laboratory Biomarker Analysis, Paclitaxel, Trastuzumab, Endocrine therapy
Drug · Other · Biological
Lead sponsor
Albert Einstein College of Medicine
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2023
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Dec 23, 2024 · Synced Sep 29, 2026, 1:24 PM EDT
Completed Phase 2 Interventional Results available

Umbrella Trial of Subtype-Targeted Therapies in ER+/HER2- Breast Cancer

NCT05101564
View directory record Official record
Conditions
Breast Cancer, HER2-negative Breast Cancer, ER Positive Breast Cancer
Interventions
Alpelisib, Tamoxifen, Zotatifin, Fulvestrant
Drug
Lead sponsor
Jennifer Lee Caswell-Jin
Other
Eligibility
18 Years and older
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Feb 11, 2026 · Synced Sep 29, 2026, 1:24 PM EDT